JP2001133699A - Focusing device for binoculars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a focusing device for dual axis interlocking binoculars. SOLUTION: A connection rod 300 is provided with three arms 301, 302, and 303 which are radially extended columnar members and assumes an approximate Y shape as a whole. Centers of holes 301A and 302A coincide with optical axes of corresponding objective lenses. Columnar projection parts 421L and 421R are formed on holding tools 42L and 42R respectively which hold an eyepieces group. The columnar projection part 421L is held between the head of a pin 311 and then arm 301 and is supported by the arm 301, rotatably around the center of the hole 301A. The columnar projection part 421R is held between the head of a pin 312 and the arm 302 and is supported by the arm 302, so that it can be rotated around the center of the hole 302A. A revolving shaft 51 is screwed with a hole 303A of the arm 303. A guide rod 60 is inserted slidably through a hole 304A of a connection part 304.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing device for binoculars linked with two axes.

[0002]

2. Description of the Related Art Conventionally, binoculars have an interpupillary distance adjusting function. The interpupillary distance adjusting function is a function of adjusting the distance between the optical axes of the pair of eyepiece optical systems according to the width of both eyes of the user. 2. Description of the Related Art As binoculars having an interpupillary distance adjusting function, a biaxial interlocking type is known. In two-axis interlocking binoculars, by swinging a pair of eyepiece optical systems in conjunction with the optical axis of the corresponding objective optical system as the center of rotation,
The distance between the optical axes of the pair of eyepiece optical systems is adjusted.

[0003] On the other hand, binoculars use an optical system that constitutes each telephoto optical system in order to focus an object image formed by a pair of objective optical systems with an eyepiece optical system in accordance with the distance of the object. A part can be moved along the optical axis. In the above-described two-axis interlocking binoculars, the eyepiece optical system is held so as to be swingable for adjusting the interpupillary distance.
In general, the focusing operation is performed by moving the objective optical system along the optical axis.

[0004]

When a zoom function and an image blur correction function are added to such two-axis linked binoculars, a variable power optical system and a correction optical system for image blur are provided near the objective optical system. If the system is integrally provided, there is a great advantage that components can be shared and design space can be saved. However, as described above, a mechanism for movably supporting the objective optical system for focusing operation is provided near the objective optical system, and it is difficult to integrally provide an optical system for additional functions. is there. As a result, there is a problem that the addition of a zoom function, an image blur correction function, and the like increases the size of the entire binoculars.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a focusing device for two-axis interlocking binoculars applicable to various models.

[0006]

The binocular focusing device according to the present invention includes a pair of telephoto optical systems, and in each of the pair of telephoto optical systems, the objective optical system is fixedly provided by a single support member. Supported, the eyepiece optical axis of the eyepiece optical system is parallel to the objective optical axis of the objective optical system at a predetermined distance,
And in order that the eyepiece optical system can swing about the optical axis of the objective system, an eyepiece unit having an eyepiece optical system holding unit that holds the eyepiece optical system is rotatably supported by a support member. A connecting member for connecting the respective eyepiece optical system holding portions of the pair of telephoto optical systems, and a driving member for driving the connecting member in a direction parallel to the eyepiece optical axis.

Preferably, the driving member is screwed to the connecting member, is rotatable around an axis parallel to the optical axis of the eyepiece system, and is fixed in a direction parallel to the axis. A rotation preventing member for preventing rotation motion from being transmitted to the connecting member.

Preferably, the rotation preventing member is a columnar member extending in the longitudinal direction parallel to the drive shaft and penetrating the connecting member, and guides the movement of the connecting member in a direction parallel to the optical axis of the eyepiece system.

Preferably, the connecting member supports a rotation preventing member supporting portion for supporting the rotation preventing member, a driving shaft supporting portion on which the driving shaft is screwed, and each of the eyepiece optical system holding portions of the pair of telephoto optical systems. A pair of optical system support portions, a first connection portion connecting one of the pair of optical system support portions and the rotation prevention member support portion, and a second connection portion connecting the other of the rotation prevention member support portion and the pair of optical system support portions. A second connection portion; and a third connection portion connecting the drive shaft support portion and the rotation preventing member support portion.

In the connecting member, the length of the third connecting portion along the longitudinal direction is, for example, shorter than the length of the first connecting portion and the second connecting portion along the longitudinal direction, or the length of the first connecting portion. It is longer than the length along the longitudinal direction of the portion and the second connecting portion.

Preferably, in the single support member, the objective optical system support for supporting the objective optical system and the eyepiece optical system support for supporting the eyepiece unit are integrally formed, and the drive shaft and the rotation preventing member are formed integrally. The members are each supported by a bearing provided on the support member.

Preferably, in each of the pair of telephoto optical systems, a movable optical system is provided between the objective optical system and the image inverting optical system, and the movable optical system includes, for example, a correction for image blur correction. An optical system, and a drive mechanism for driving a correction optical system is provided between the objective optical system and the image inversion optical system.

In the present invention, a portion for supporting the eyepiece optical system so as to be able to swing around the optical axis of the corresponding objective optical system and a portion for supporting the eyepiece optical system slidably along the optical axis are single. Are connected by a connecting member. Accordingly, it is possible to perform a biaxial pupil distance adjustment in which the pair of eyepiece optical systems swings around the optical axes of the corresponding objective optical systems, and it is also possible to perform a focusing operation by driving the eyepiece optical systems. .

According to the present invention, since the focusing operation is performed by moving the pair of eyepiece optical systems, the size of the focusing mechanism can be reduced as compared with the case where the objective optical system having a relatively large mass is moved. It is planned.

In the connecting member, when the length of the third connecting portion along the longitudinal direction is shorter than the length of the first connecting portion and the second connecting portion along the longitudinal direction, the rotation preventing member is provided. Sufficient space is secured below the support portion, that is, at a portion sandwiched between the second connection portion and the third connection portion. Therefore,
Other members of the binoculars can be provided, and the size of the entire binoculars can be reduced.

In the case where the connecting member is formed such that the length of the third connecting portion along the longitudinal direction is longer than the length of the first connecting portion and the second connecting portion along the longitudinal direction, the drive shaft and the second connecting portion are connected to each other. Since the distance to the rotation preventing member is sufficiently provided, when the connecting member is moved along the optical axis of the eyepiece system for focusing operation, the connecting member is more stably guided by the rotation preventing member.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In this specification, "longitudinal" is a direction orthogonal to a plane including two optical axes extending in parallel, that is, a direction orthogonal to the plane of FIG. 1, and "horizontal" is two optical axes extending in parallel. Is a direction parallel to a plane including the optical axis and parallel to an axis orthogonal to the two optical axes, that is, a horizontal direction in FIG.

FIG. 1 is a partial cross-sectional view of a pair of binoculars 1 to which an embodiment according to the present invention is applied, taken along a plane parallel to a plane including a pair of optical axes, and FIG. 2 is a side view of FIG. FIG. In FIGS. 1 and 2, some members are omitted to clearly show the configuration, and some members are shown in perspective.

The light beam passing through the pair of objective lenses 10L and 10R is guided to the pair of image inversion optical systems 30L and 30R via the correction lenses 20L and 20R. Image reversal optical system 3
The light beam that has passed through 0L and 30R is
It is led to 0L and 40R. That is, the left telephoto optical system includes an objective lens 10L, a correction lens 20L, an image inversion optical system 30L,
The right telephoto optical system includes an objective lens 10R, a correction lens 20R, an image inversion optical system 30R, and an eyepiece lens group 40R. Ol indicates the optical axis of the objective lens 10L, Or indicates the optical axis of the objective lens 10R, Ol 'indicates the optical axis of the eyepiece lens group 40L, and Or' indicates the optical axis of the eyepiece lens group 40R.
3 shows the optical axis.

The pair of objective lenses 10L and 10R are held by objective lens barrels 11L and 11R, respectively, and the pair of correction lenses 20L and 20R are held by a single correction lens holding frame 200 of the image blur correction device 20. . Note that the image blur correction device 20 is for correcting blur of the optical axes of the left and right telephoto optical systems caused by camera shake of the user when using the binoculars 1. As described above, the image blur correction device 20 including the correction lenses 20L and 20R and a drive mechanism of these correction lenses, which will be described later,
L, 10R and the image reversing optical systems 30L, 30R.

The eyepiece unit 31L includes a prism frame 32L and an eyepiece lens frame 33L. In the prism frame 32L, an image reversing optical system 30L, which is a Porro prism formed of two right-angle prisms and forming an erect image, is provided. The eyepiece lens group 40L is held by an eyepiece lens barrel 41L, and the eyepiece lens barrel 41L is attached to an eyepiece lens frame 33L via a holder 42L. The holder 42L is slidably supported by the eyepiece frame 33L along the optical axis Ol ′. Also, the prism frame 32L and the eyepiece frame 33
A cylindrical eyepiece tube support frame 34L extending toward the prism frame 32L side is formed at the connection portion of L. The eyepiece tube support frame 34L slidably supports an end positioned inside the binoculars in the eyepiece lens tube 41L, and guides the movement of the holder 42L along the optical axis Ol ′.

Similarly, the eyepiece unit 31R includes a prism frame 32R and an eyepiece frame 33R.
Inside, an image inversion optical system 30 similar to the image inversion optical system 30L is provided.
R is provided. The eyepiece lens group 40R is held by an eyepiece lens barrel 41R, and the eyepiece lens barrel 41R is held by a holder 42.
It is attached to the eyepiece frame 33R via R.
The holder 42R is slidably supported along the optical axis Or 'by the eyepiece frame 33R. Also, prism frame 3
A prism frame 3 is provided at a connection portion between the 2R and the eyepiece frame 33R.
A cylindrical eyepiece tube support frame 34R extending toward the 2R side
Are formed. The eyepiece tube support frame 34R slidably supports the end of the eyepiece lens tube 41R on the side disposed inside the binoculars, and guides the movement of the holder 42R along the optical axis Or ′.

In the prism frame 32L, the correction lens 20
A cylindrical mounting frame 35L extending toward the correction lens 20L is formed on the L side, and a cylindrical mounting frame 35R extending toward the correction lens 20R is formed on the correction lens 20R side of the prism frame 32R. Have been.

A cylindrical roller 50 is provided between the prism frames 32L and 32R. The rolling wheel 50 is positioned so that its axis is parallel to the optical axes Ol, Or, Ol ', and Or'. A wheel shaft 51 is fixed to the axis of the wheel 50, and the wheel shaft 51 rotates with the rotation of the wheel 50. The guide rod 60 of the columnar member has an optical axis O
l ′, Or ′, along the direction parallel to
And on the bottom side when the binoculars 1 are used with respect to the wheel shaft 51 (see FIG. 2).

The end of the wheel shaft 51 positioned on the side of the objective lenses 10L and 10R is a support hole 102A of the mounting base 100.
It is supported by. The eyepiece group 40L of the wheel axis 51,
The end positioned on the 40R side is a screw 71 on the reinforcing plate 70.
It is fixed by. The longitudinal direction of the reinforcing plate 70 is the optical axis O.
It is a plate-shaped member positioned so as to be orthogonal to the plane including l 'and Or'. Objective lens 10L, 10 of guide rod 60
The end positioned on the R side is the support hole 10 of the mounting base 100.
2B. In the reinforcing plate 70, the wheel shaft 5
At the end opposite to the end where 1 is fixed, the end positioned on the eyepiece group 40L, 40R side of the guide rod 60 is fixed with a screw 72. That is, the wheel shaft 51 and the guide rod 60 are connected to the objective lenses 10L and 10L.
The ends on the R side are respectively supporting holes 102A of the mounting base 100,
The end portions on the side of the eyepiece lens groups 40L and 40R are supported by the reinforcing plate 70. In addition, the mounting base 100
The details of the support structure of the wheel shaft 51 and the guide rod 60 in the above will be described later.

FIG. 3 shows the mounting base 100 connected to the objective lens barrel 1.
It is a perspective view shown from the side where 1R and 11L are attached. The mounting table 100 includes an objective side holding unit 101 (objective optical system holding unit) for supporting the objective lens barrels 11R and 11L, and an eyepiece side holding unit 102 (a swing member) for supporting the eyepiece units 31L and 31R. Holding unit) and a connecting unit 10 for connecting the objective side holding unit 101 and the eyepiece side holding unit 102
3 is provided. The objective-side holding unit 101, the eyepiece-side holding unit 102, and the connecting unit 103 each have a plate shape and are integrally formed. Further, the object side holding unit 101 and the eyepiece side holding unit 102 are provided so as to be parallel to each other, and the connecting unit 103 is composed of the object side holding unit 101 and the eyepiece side holding unit 102
Are provided so as to be orthogonal to. That is, the mounting table 100 is a plate-shaped member having a U-shaped cross section cut along a plane orthogonal to the plane including the optical axes Ol and Or (see FIG. 2).

At the center of the upper side and the center of the lower side of the object side holding portion 101, a notch 101 cut in a triangular shape toward the center of the object side holding portion 101.
U and 101B are formed respectively. Notch 1
Circular mounting holes 101L and 101R are formed at symmetrical positions with respect to 01U and 101B. Mounting hole 1
The objective lens barrel 11L is fixed to 01L, and the objective lens barrel 11R is fixed to the mounting hole 101R.

At the center of the upper side of the eyepiece-side holding part 102, a triangular wheel shaft supporting part 102U extending toward the side opposite to the connecting part 103 is integrally formed. As the axis extending in the direction perpendicular to the connecting portion 103 through the vertex of the wheel shaft supporting portion 102U passes through the center of the eyepiece side holding portion 102,
The wheel shaft support 102U is positioned. Circular mounting holes 102L and 102R are formed at symmetrical positions with respect to an axis passing through the apex of the wheel shaft 102U. The mounting frame 3 of the eyepiece unit 31L is provided in the mounting hole 102L.
5L is rotatably fitted, and the mounting frame 35R of the eyepiece unit 31R is rotatably fitted into the mounting hole 102R.

The support hole 102A for supporting the wheel shaft 51 is formed near the apex of the wheel shaft support portion 102U, and the support hole 102B for supporting the guide rod 60 is formed near the bottom of the wheel shaft support portion 102U. Has been established. Support hole 10
The 2A and the support hole 102B are positioned such that a line connecting the centers of the 2A and the support hole 102B is orthogonal to the connecting portion 103.

FIG. 4 shows that the mounting table 100 is
It is a front view shown from the side. Diameter RL1 of mounting hole 101L
Is larger than the diameter RL2 of the mounting hole 102L.
The center of L and the center of the mounting hole 102L coincide. Similarly, the diameter RR1 of the mounting hole 101R is equal to the diameter R of the mounting hole 102R.
R2, the center of the mounting hole 101R and the mounting hole 102
The centers of R are coincident. As described above, the objective side holding unit 101 and the eyepiece side holding unit 102 are parallel to each other. That is, an axis core line CL1 passing through the geometric center of gravity of the mounting hole 101L, which is a circular opening, and orthogonal to the objective side holding unit 101, and passing through the geometric center of gravity of the mounting hole 102L, which is a circular opening, on the eyepiece side holding unit. The axis CL2 perpendicular to 102 coincides,
An axial center line CR1 that passes through the geometric center of gravity of the mounting hole 101R that is a circular opening and is orthogonal to the objective-side holding unit 101 and the geometric center of gravity of the mounting hole 102R that is a circular opening passes through the eyepiece-side holding unit 102. The mounting holes 101L, 101R, 102L, and 102 are attached so that the orthogonal axis cores CR2 coincide with each other.
R is formed.

The eyepiece units 31L and 31R are mounted on the mount 100 as follows. Eyepiece unit 31L
Threads are engraved on the outer peripheral surface of the mounting frame 35L.
A nut 91 is fastened to the end of the mounting frame 35L (see FIG. 1). A washer 92 is provided between the nut 91 and the surface of the eyepiece holding unit 102 on the object side.
Accordingly, the mounting frame 35L is rotatable about the optical axis Ol and the optical axis Ol of the entire eyepiece unit 31L.
Is prevented from moving in the direction along. Similarly, mounting frame 3
A thread is engraved on the outer peripheral surface of the 5R, and the mounting frame 35 is formed.
A nut 93 is fastened to the end of R, and a washer 94 is disposed between the nut 93 and the surface of the eyepiece holding unit 102 on the object side. Accordingly, the mounting frame 35R is rotatable around the optical axis Or, and the movement of the entire eyepiece unit 31R in the direction along the optical axis Or is prevented.

Incidentally, set screws (not shown) are provided on the outer peripheral surfaces of the nuts 91 and 93, and fix the nuts 91 and 93 in directions along the optical axes Ol and Or, respectively. Therefore, the screwed state between the nut 91 and the mounting frame 35L and the nut 93 and the mounting frame 35R are maintained.

The wheel shaft 51 and the guide bar 60 are mounted on the mounting table 100 as follows. The cylindrical holder 52 has a large diameter portion 52A and a small diameter portion 52B (see FIGS. 1 and 2). A thread is formed in the small diameter portion 52B, and is screwed into a female screw formed on the inner wall surface of the support hole 102A of the mounting base 100. The surface on the side where the small diameter portion 52B is provided in the large diameter portion 52A is in contact with the surface on the eyepiece side of the eyepiece side holding portion 102 of the mounting base 100. That is, the holder 52 is fixed to the support hole 102A. A bearing 52C that penetrates the large-diameter portion 52A and the small-diameter portion 52B is bored inside the holder 52, and the wheel shaft 51 is rotatably inserted around the shaft center through the bearing 52C.

The objective lenses 10L, 1
The diameter of the end positioned on the 0R side is molded so as to be smaller than that of the body portion, and a thread is formed on the outer peripheral surface thereof. A nut 53 is fastened to this end, and a washer 54 is provided between the nut 53 and the body portion of the wheel axle 51 having a larger diameter than the end. Therefore, the wheel shaft 51 is rotatable around the axis and is fixed in a direction along the axis.

In the guide rod 60, the objective lens 10L,
The end positioned on the 10R side is formed to have a diameter smaller than that of the other body portion, and a thread is formed on the outer peripheral surface thereof. This end portion is inserted through the support hole 102B formed in the wheel shaft support portion 102U of the eyepiece side holding portion 102 of the mounting base 100 described above. Further, a surface parallel to a surface orthogonal to the optical axis Or in the body portion having a diameter larger than the end portion is in contact with a surface on the eyepiece side of the eyepiece side holding portion 102 of the mounting base 100. In this state, a bolt 61 is fastened to the end of the guide bar 60, and the guide bar 60 is fixed to the support hole 102B.

As described above, the wheel shaft 51 and the guide rod 6
0 is in each axis direction, that is, the optical axis Ol ′,
In order not to move in the direction parallel to Or ', the end positioned on the side of the objective lenses 10L and 10R is
0 is fixed to the support holes 102A and 102B, and the end positioned on the eyepiece lens group 40L or 40R side is a reinforcing plate 70.
It is fixed to.

Here, the mounting holes 101L, 101R, 10R
A method of drilling 2L and 102R will be described. FIG.
FIG. 5 is a view schematically showing a state in which a workpiece 100 ′ having the same shape as the mounting base 100 is set on a lathe 150. A carriage 152 is provided on the main body 151 of the lathe 150. A blade 153 is attached to the carriage 152. The chuck 154 is coaxially fixed to a spindle (not shown) provided inside the main body 151, and rotates around the axis α of the spindle with the rotation of the spindle. The jig 155 is fixed to the chuck 154, and the workpiece 100 'is set. Therefore, the work 1
00 ′ rotates around the axis α through the jig 155 in accordance with the rotation of the chuck 154. Work body 10
0 ′ is set on the jig 155 such that surfaces 101 ′ and 102 ′ corresponding to the objective side holding unit 101 and the eyepiece side holding unit 102 are orthogonal to the axis α.

The blade 153 is positioned so that the distance between the cutting edge of the blade 153 and the axis α on a plane perpendicular to the axis α matches the radius RL1 of the mounting hole 101L (see FIG. 4). With the workpiece 100 'set on the jig 155, the carriage 152 is moved in the X direction while rotating the spindle at a high speed, and the blade 153 is brought into contact with the surface 101'. As a result, a hole having the same diameter as the mounting hole 101L is formed in the surface 101 '. Then, as it is, that is, the chuck 15
4 and the jig 155 are fixed in the same manner,
The distance between the cutting edge and the axis α is the radius RL2 of the mounting hole 102L.
Adjust the position of the blade 153 to match (see FIG. 4)
The carriage 152 is further moved in the X direction while rotating the spindle at a high speed, and the blade 153 is brought into contact with the surface 102 '. As a result, a hole having the same diameter as the mounting hole 102L is formed on the surface 102 '.

The mounting holes 1 are provided on the surfaces 101 'and 102', respectively.
When the holes corresponding to 01L and 102L are formed, the rotation of the spindle is stopped and the carriage 152 is returned to the original position.
The processed body 100 ′ is formed such that the axis α of the spindle is orthogonal to a portion where no hole is formed in the surfaces 101 ′ and 102 ′.
Is set again on the jig 155, and the above-described steps are repeated.
As a result, a hole having the same diameter as the mounting hole 101R is formed in the surface 101 ', and a hole having the same diameter as the mounting hole 102R is formed in the surface 102'.

As described above, after the processing on the surface 101 'is completed, the processing on the surface 102' is performed without removing the chuck 154 and the jig 155. As a result, the processing on the surface 101 ′ and the processing on the surface 102 ′ both have the same axis α.
This is performed while rotating the workpiece 100 ′ about. Therefore, in the surfaces 101 'and 102', the surface 1
The centers of the holes formed on the same side with respect to the center line of the workpiece 100 ′ orthogonal to 01 ′ and 102 ′ coincide with each other. By drilling a hole in the workpiece 101 'in the above-described procedure, the mounting base 100 shown in FIGS. 3 and 4 is obtained.

The relative positions of the two holes formed on the surface 101 'are the same as the relative positions of the mounting holes 101L and 101R in the object side holding portion 101 of the mounting table 100, and are on the surface 102'. The relative positions of the two holes formed are the mounting holes 102L, 10L,
The position of the carriage 152 in the direction orthogonal to the plane of FIG. 5 is adjusted as appropriate so that the relative position of the carriage 2R becomes the same.

In the above-described processing, a step of first forming a hole in the surface 101 'and then forming a hole in the surface 102' is adopted, but the present invention is not limited to this. For example, the processing may be performed in such a manner that a hole is formed in the surface 102 'and then a hole is formed in the surface 101'.

FIGS. 6 and 7 are front views showing the main part of the image blur correction device 20 according to the present embodiment, and FIG.
FIG. 7 is a view from the eyepiece-side holding unit 102, and FIG. 7 is a view from the objective-side holding unit 101. Correction lens holding frame 200
Has a vertical drive frame 201 and a horizontal drive frame 202. The vertical drive frame 201 is a substantially rectangular flat plate and has a donut shape having an opening. The opening of the vertical drive frame 201 is formed such that the inner wall surfaces 201A and 201B are parallel to the horizontal direction. A horizontal drive frame 202 is provided in the opening of the vertical drive frame 201. The lateral drive frame 202 is a rectangular plate-like member that integrally holds the correction lenses 20L and 20R having the same mass and shape. The vertical drive frame 201 and the horizontal drive frame 202
The correction lenses 20L and 20R are molded so that the thickness in the direction along the optical axis is the same (see FIGS. 1 and 2).

The driving assist plate 210 is a plate-like member whose longitudinal direction extends in the vertical direction, and is fixed to the connecting portion 103 of the mounting base 100 by screws 211 (see FIG. 2). A substantially central portion of the correction lens holding frame 200, that is, the correction lens 20L,
The correction lens holding frame 200 and the drive assist plate 210 are positioned inside the binoculars 1 such that the drive assist plate 210 is located at a portion corresponding to the interval between 0R.

The guide hole 2 is formed in a portion of the drive auxiliary plate 210 corresponding to the upper end 201U of the vertical drive frame 201.
10U is drilled and the lower end 201 of the vertical drive frame 201 is
A guide hole 210L is formed in a portion corresponding to L.

At the approximate center of the upper end 201U and the approximate center of the lower end 201L of the vertical drive frame 201, cylindrical guide pins 20 projecting toward the eyepiece lens groups 40L and 40R are provided.
3 and 204 are provided respectively. Guide pin 20
The outer diameter of 3, 204 is slightly smaller than the lateral width of guide holes 210U and 210L. Therefore, the guide pin 20
3 and 204 are guide holes 210U and 210L, respectively.
And can be moved in the vertical direction. The tip of the guide pin 204 has a half-moon cross-sectional shape,
The plane 204A protrudes toward the eyepiece lens groups 40L and 40R so that the plane 204A is parallel to the horizontal direction and faces the y1 direction.

A coil spring 240 is provided near the correction lens 20L at the upper end 201U of the vertical drive frame 201. Both ends of the coil spring 240 have a hook shape, and one end is engaged with a screw 241 fitted in the upper end 201U near the end on the side where the correction lens 20L is provided, The other end is a screw 2 fitted near the guide hole 210U of the drive assist plate 210.
42. Similarly, a coil spring 250 is provided near the correction lens 20L at the lower end 201L of the vertical driving frame 201. Both ends of the coil spring 250 have a hook shape, and one end is connected to the lower end 20.
In 1L, it engages with a screw 251 fitted near the end on the side where the correction lens 20L is provided, and the other end is
It is engaged with a screw 252 fitted in the vicinity of the guide hole 210L of the drive assist plate 210.

That is, the coil springs 240 and 250 constantly apply the urging force in the x1 direction to the vertical drive frame 201. Therefore, the guide pin 203 is always in contact with the inner wall surface of the guide hole 210U on the correction lens 20R side, and the guide pin 204 is always in contact with the inner wall surface of the guide hole 210L on the correction lens 20R side.

The weights and dimensions of the guide pins 203 and 204 are determined by the vertical drive frame 201 and the horizontal drive frame 20.
Very small compared to 2. Therefore, the lens holding frame 2
The center of gravity of 00 is located at the approximate center of the width in the direction parallel to the optical axis of the correction lenses 20L and 20R in the lateral drive frame 202. Further, a point (not shown) at which the center of gravity is projected on the drive assist plate 210 along a direction parallel to the optical axes of the correction lenses 20L and 20R is defined by a guide pin 203 and a guide hole 210U
Is located near the vertical center of the horizontal drive frame 202 on a line connecting the contact portion between the guide pin 204 and the guide hole 210L.

The guide holes 210U and 210L have the same shape and the same size, and are positioned symmetrically with respect to a line passing through the projection point of the center of gravity of the lens holding frame 200 and parallel to the horizontal direction. When the binoculars 1 are used, the guide pins 203 and 204 are in the guide holes 210U and 210L, respectively.
The optical axes of the correction lenses 20L and 20R and the optical axes of the other optical systems of the binoculars 1 coincide with each other.

The pedestal 220 is an L-shaped plate-like member.
The mounting base 100 is fixed by screws 221 on the surface of the eyepiece side holding unit 102 on the side of the object side holding unit 101 (see FIG. 2). The vertical actuator 230 includes a stepping motor 231 and a shaft 232. The stepping motor 231 includes a motor case 231a and a motor 231b provided in the motor case 231a, and the motor 231b can rotate forward and reverse around an axis extending in a vertical direction. The motor case 231a is fixed to the pedestal 220, and the motor 231b is inserted through a hole (not shown) formed in the pedestal 220 and protrudes in the y2 direction. The shaft 232 rotates integrally with the motor 231b in the rotation direction of the motor 231b, and
1b so as to be movable. A lead screw is formed on the outer peripheral surface of the shaft 232, and is screwed into a female screw (not shown) formed on the shaft bearing of the motor case 231a. That is, the shaft 232 advances and retreats along its axial direction while rotating with respect to the forward / reverse rotation of the motor 231b. A ball is embedded at the tip of the shaft 232, and the ball presses a target. The tip of the shaft 232 is connected to the guide pin 20 described above.
No. 4 is in contact with the flat surface 204A.

Although not shown in FIGS. 6 and 7, the vertical drive frame 201 is provided with coil springs at both ends. One end of the coil spring is fixed to the vertical drive frame 201, and the other end is fixed to the inner wall surface (not shown) of the binoculars 1.
1 is constantly biased in the y1 direction. Therefore, the tip of the shaft 232 of the vertical actuator 230 is
It is always in contact with the plane 204A of the guide pin 204 (see FIGS. 2 and 6).

Vertical drive frame 201 and horizontal drive frame 20
A horizontal actuator 260 is provided near the lower ends of the objective lenses 10L and 10R, and a correction lens 20L is provided at the center of the vertical drive frame 201 and the horizontal drive frame 202 in the vertical direction. It is disposed on the side where it is provided (see FIGS. 1, 2, and 7). Lateral actuator 2
Reference numeral 60 includes a stepping motor 261 and a shaft 262. The stepping motor 261 is a motor case 26
1a and a motor 26 provided in a motor case 261a.
1b, and the motor 261b can rotate forward and reverse around an axis along the lateral direction. Shaft 262 is motor 2
The motor 261b rotates integrally with the motor 261b in the rotation direction of 61b, and is supported so as to be movable with respect to the motor 261b in the axial direction. A lead screw is formed on the outer peripheral surface of the shaft 262, and is screwed into a female screw (not shown) formed on the shaft bearing of the motor case 261a. That is, the shaft 262 advances and retreats along its axial direction while rotating with respect to the forward / reverse rotation of the motor 261b. A ball is embedded at the tip of the shaft 262, and the ball presses a target.

As shown in FIG. 7, a coil spring 290 is provided near the lower end 201L of the vertical drive frame 201. The coil spring 290 is similar to other coil springs.
Both ends have a hook shape, one end is engaged with a screw 291 fitted to the vertical drive frame 201, and the other end is a pressed member 292 fixed to the horizontal drive frame 202.
Is engaged with a hole (not shown) formed in the hole. That is, the coil spring 290 constantly applies a biasing force to the pressed member 292 in the x2 direction. Therefore, the lateral actuator 2
The tip of the shaft 262 is always pressed against the pressed member 29.
It is in contact with 2.

As shown in FIG. 2, the stepping motor 2
A substantially rhombic flange 261c is integrally formed at one end of the motor case 261a. The flange 261c is fixed to a flat fixing member 270 fixed to the lower end 201L of the vertical drive frame 201 by a screw 270a and a screw 270b positioned on the opposite side of the screw 270a across the motor case 261a. I have.
That is, the motor case 261a is fixed to the vertical drive frame 201 via the flange 261c and the fixing member 270.

As shown in FIG. 1, the stepping motor 2
A substantially rhombic flange 231c is integrally formed at one end of the motor case 231a of the motor case 231.
It is held by a screw 233b positioned on the opposite side of the screw 233a across the 31a. That is, the motor case 231a is fixed to the mounting base 100 via the flange 231c and the pedestal 220.

Further, as shown in FIG. 1, a thin plate-shaped drive frame support member 390 is disposed near both ends of the vertical drive frame 201 in the connecting portion 103 of the mounting base 100. The drive frame support member 390 includes a fixed portion 390A fixed on the connecting portion 103, and a support portion 390B continuous with the fixed portion and extending in a direction perpendicular to the fixed portion. The optical axes Ol and Or of the vertical drive frame 201 are provided on the support portion 390B.
Lead plate 391 having a thickness substantially equal to the thickness along the direction
Has been fixed. The side end surface of the lead plate 391 is the mounting base 1
The vertical drive frame 201 is abutted so as to be slidable along a direction orthogonal to the connecting portion 103.

When the motor 231b rotates forward, the shaft 2
While rotating, it projects in the y2 direction against the urging force of a coil spring (not shown). The movement of the shaft 232 in the y2 direction is transmitted to the vertical drive frame 201 via the columnar pin 204. As described above, since the vertical drive frame 201 is slidably supported by the lead plates 391 at both ends, the vertical drive frame 201 is urged by the coil spring in the y1 direction in accordance with the forward rotation of the motor 231b. Is driven in the y2 direction (see FIG. 6). On the other hand, when the motor 231b rotates in the reverse direction, the shaft 232 is pulled in the y1 direction while rotating,
The vertical drive frame 2 is generated by the urging force of the coil spring in the y1 direction.
01 is driven in the y1 direction.

When the motor 261b rotates forward, the shaft 2
62 projects in the x1 direction against the urging force of the coil spring 290 while rotating. The movement of the shaft 262 in the x1 direction is transmitted to the lateral drive frame 202 via the pressed member 292. As described above, since the horizontal drive frame 202 is slidably supported by the vertical drive frame 201, the horizontal drive frame 202 applies the urging force of the coil spring 290 in the x2 direction according to the forward rotation of the motor 261b. (See FIG. 7). On the other hand, when the motor 261b rotates in the reverse direction, the shaft 262 is pulled in the x2 direction while rotating, and the lateral drive frame 202 is driven in the x2 direction by the urging force of the coil spring 290 in the x2 direction.

When a switch button (not shown) provided on the binoculars 1 is pressed by a user, the image blur correcting device 2
The image blur correction control by 0 is performed. At the start of the image blur correction control, the optical axis OP1 of the correction lens 20L coincides with the optical axis Ol of the objective lens 10L, and the optical axis O of the correction lens 20R.
The vertical drive frame 201 and the horizontal drive frame 202 are positioned so that P2 coincides with the optical axis Or of the objective lens 10R.

The angular velocities of the optical axes of the left and right telescopic optical systems due to camera shake or the like are detected by a gyro sensor or the like (not shown), and the angular velocities are integrated by a control device (not shown), and the angular position of the optical axis is calculated. Is calculated, and the difference between the position where the optical axis of each lens coincides and the angular position of the optical axis calculated by the integration process is calculated. Further, in order to move the correction lenses 20L and 20R so as to eliminate the difference, the vertical actuator 230 and the horizontal actuator 2 are moved.
The drive amount of 60, that is, the number of rotation steps of the motors 231b and 261b is calculated by the control device. The motors 231b and 261b are driven based on the calculated number of rotation steps, the vertical drive frame 201 and the horizontal drive frame 202 move in the vertical direction and the horizontal direction, respectively, and the optical axis of the telephoto optical system is corrected. You.

A screw 393 is fixed to the lead plate 391 via a washer 392 (see FIG. 1). The washer 3 is arranged such that a part of the peripheral edge of the washer 392 projects toward the longitudinal drive frame 201 from the side end of the lead plate 391.
92 and screw 393 are positioned. The length of the support portion 390B of the drive frame support member 390 is longer than the lead plate 391 in a direction parallel to the direction orthogonal to the optical axes Ol and Or. That is, the side edge of the vertical drive frame 201 is sandwiched between the peripheral portion of the washer 392 and the side portion of the support portion 390B. Therefore, the movement of the vertical drive frame 201 in the direction parallel to the optical axes OP1 and OP2 is prevented.

The support member 280 has a screw 281, a nut 282, and a washer 283 (see FIGS. 6 and 7). The shaft of the screw 281 is threaded, and the shaft passes through the vertical drive frame 201. A nut 282 is fastened to the end of the screw 281 on the opposite side of the head (see FIG. 6). Washers 283 are provided between the head of the screw 281 and the vertical drive frame 201 and between the nut 282 and the vertical drive frame 201, respectively. The pair of washers 283 are positioned near the horizontal drive frame 202 on both sides orthogonal to the optical axes OP1 and OP2 of the vertical drive frame 201, respectively, and are directed toward the horizontal drive frame 202 in a plane including both side faces. It is arranged to protrude. That is, the lateral drive frame 202 is clamped at a part of a peripheral portion of the washer 283 at an end thereof, and is held so as not to move in a direction parallel to the optical axes OP1 and OP2.

Further, the holes 21 in the drive assist plate 210
A shaft stop plate 212 is fixed by screws near the lower end of 0U (see FIG. 2). Shaft stop plate 21
Reference numeral 2 denotes an L-shaped plate-like member having a fixed portion parallel to the drive support plate 210 and a stop portion extending in a direction continuous with the fixed portion and orthogonal to the fixed portion. Shaft stop plate 212
Is disposed such that its stop portion faces the end of the shaft 232 of the vertical actuator 230 opposite to the end that abuts the guide pin 204. The stop of the shaft stop plate 212 is positioned at a position beyond the movable range of the shaft 232 in the above-described image blur correction control. Therefore, the shaft 232 is prevented from protruding more than necessary due to unexpected external force applied to the binoculars 1, and the screwing relationship between the lead screw of the shaft 232 and the female screw of the motor case 231 a is maintained.

As shown in FIGS. 1 and 2, the eyepiece unit 3
A connecting rod 300 is provided between 1L and 31R. The connecting rod 300 is positioned closer to the image reversing optical systems 30L and 30R than the holders 42L and 42R. FIG. 8 is a front view showing the connecting rod 300 from the eyepiece side. The connecting rod 300 is composed of three arms 301 and 3 which are columnar members extending radially.
02 and 303, and have a substantially Y-shape as a whole when viewed from the eyepiece side. Arms 301 and 302
Are provided with holes 301A and 302A for supporting the holders 42L and 42R, respectively. Hole 301
The center of A coincides with the optical axis Ol of the objective lens 10L, and the center of the hole 302A coincides with the optical axis Or of the objective lens 10R.

The holder 42L has a columnar projection 421L integrally formed on the outer peripheral surface thereof.
At the end of 21L, a hole having a diameter slightly larger than the diameter of the hole of the arm 301 is formed. Similarly, the holder 42R has a columnar projection 421R integrally formed on the outer peripheral surface thereof, and the end of the columnar projection 421R has a diameter slightly larger than the diameter of the hole of the arm 302. Holes are drilled.

A pin 311 is inserted through the hole 301A and the hole of the columnar projection 421L, and the head of the pin 311 is in contact with the surface on the eyepiece side of the columnar projection 421L. Pin 3
Numeral 11 is fixed to the hole 301A, and the column-shaped projection 421L is fitted into the hole of the column-shaped projection 421L so as to be rotatable around the center of the hole. Similarly, a pin 312 is inserted into the hole of the hole 302A and the hole of the columnar projection 421R, and the head of the pin 312 is in contact with the eyepiece side surface of the columnar projection 421R. The pin 312 is fixed to the hole 302A, and the hole of the columnar projection 421R is inserted into the columnar projection 421R.
Are fitted so as to be rotatable around the center of the hole.

The arm 301 is in contact with the object-side surface of the columnar projection 421L, and the arm 302 is in contact with the object-side surface of the columnar projection 421R (see FIG. 1). That is, the columnar projection 421L is connected to the head of the pin 311 and the arm 301.
, And is rotatably supported by the arm 301 around the optical axis Ol of the objective lens 10L. The columnar protrusion 421R is sandwiched between the head of the pin 312 and the arm 302, and the optical axis of the objective lens 10R. The arm 302 is rotatably supported about Or as a rotation center.

Further, on the prism frame 32L of the eyepiece unit 31L and the prism frame 32R of the eyepiece unit 31R, interlocking gears 321L, 321 are provided on outer peripheral surfaces facing each other.
R is formed, and the interlocking gears 321L and 321R mesh with each other.

As described above, the mounting frame 35L of the left eyepiece unit 31L is rotatably fitted into the mounting hole 102L of the mounting base 100, and the mounting frame 35R of the right eyepiece unit 31R is rotated by the mounting hole 102R of the mounting base 100. Mating possible, while
The holder 42L is rotatably supported about the optical axis Ol of the objective lens 10L, and the holder 42R is rotatably supported about the optical axis Or of the objective lens 10R. That is, the entire left eyepiece unit 31L is rotatable around the optical axis of the objective lens 10L, and the entire right eyepiece unit 31R is rotatable around the optical axis of the objective lens 10R. It is done. Therefore, by applying an external force to the left eyepiece unit 31L and the right eyepiece unit 31R around the optical axis, the optical axes Ol ′ of the eyepiece group 40L and the eyepiece group 40R are maintained while the positions of the objective lenses 10L and 10R are maintained. Optical axis O
The distance between r ′ can be adjusted, and the interpupillary distance can be adjusted according to the user.

For example, FIG. 8 shows a state in which the interpupillary distance is maximized. In this state, an external force is applied so that the left eyepiece unit 31L rotates clockwise and the right eyepiece unit 31R rotates counterclockwise. And the left eyepiece unit 31L and the right eyepiece unit 31R are respectively connected to the optical axis O of the objective lens 10L.
l, rotates in conjunction with the optical axis Or of the objective lens 10R as a center of rotation. As a result, as shown in FIG. 9, the distance between the optical axis of the eyepiece lens group 40L and the optical axis of the eyepiece lens group 40R is reduced.

The end of the arm 303 of the connecting rod 300 has a cylindrical shape whose center axis extends in the direction along the optical axes Ol ′ and Or ′ (see FIGS. 1 and 2), and a hole 303 is provided therein.
A is drilled. A female screw is formed on the inner wall surface of the hole 303A, and the wheel shaft 51 is screwed thereto. Also, arms 301 to 30 extending radially in the connecting rod 300
A hole 304 </ b> A is formed in the center portion 304 connecting the 3. The guide rod 60 is slidably inserted through the hole 304A.

When the user rotates the wheel 50, the wheel 5
With the rotation of 0, the wheel shaft 51 rotates about the center axis as the center of rotation. As described above, the wheel shaft 51 is fixed to the support hole 102A of the mounting base 100 and the reinforcing plate 70 so as not to move in the axial direction, and the guide rod 60 transmits the rotational motion of the wheel shaft 51 to the connecting rod 300. This is prevented by inserting the hole 304A of the connecting rod 300. Therefore, the connecting rod 300 moves along the optical axis O with the rotation of the wheel shaft 51.
It moves along l 'and Or'. For example, when the wheel is rotated clockwise as viewed from the eyepiece lens groups 40L and 40R, the connecting rod 300 moves in the direction approaching the objective lenses 10L and 10R along the optical axes Ol ′ and Or ′, Is rotated counterclockwise, the connecting rod 300 is moved to the optical axis Ol ′, O
It moves in a direction away from the objective lenses 10L and 10R along r '.

As described above, the columnar projection 421L of the holder 42L is sandwiched between the head of the pin 311 and the arm 301 of the connecting rod 300, and the columnar projection 421R of the holder 42R.
Is pinched between the head of the pin 312 and the arm 302 of the connecting rod 300. Therefore, the optical axis Ol ′ of the connecting rod 300,
With movement along Or ', eyepiece lens groups 40L, 40L
R also moves. Therefore, when the user rotates the wheel 50, the eyepiece groups 40L and 40R are moved along the optical axis O.
It moves along l ′ and Or ′, and a focusing operation is performed.

A guide rod 60 parallel to the wheel shaft 51 is supported by the support hole 102 B of the mounting base 100 and the reinforcing plate 70. Therefore, the movement of the connecting rod 300 along the optical axes Ol ′ and Or ′ is performed stably and smoothly.

FIG. 10 is a front view showing a connecting rod to which the second embodiment according to the present invention is applied, and FIG. 11 is a perspective view showing a mounting base of the second embodiment. In FIG. 10, the same members as those in the first embodiment are denoted by the same reference numerals. The connecting rod 500 includes three arms 50 that are columnar members.
1 (first connection), 502 (second connection), 503
(Third connecting portion). The connecting rod 500 is the first rod.
Similar to the connecting rod 300 of the embodiment, the holders 42L, 42R
Is positioned closer to the image reversing optical system. Arm 501
And 502 are provided with holes 501A and 502A for supporting the holders 42L and 42R, respectively. The center of the hole 501A is located on the optical axis Ol of the objective lens 10L.
, And the center of the hole 502A matches the optical axis Or of the objective lens 10R.

The end of the arm 503 of the connecting rod 500 is the first
Similar to the arm 303 of the connecting rod 300 of the embodiment, the central axis has a cylindrical shape extending in the direction along the optical axes Ol ′ and Or ′, and a hole 503A is formed in the inside thereof. A female screw is formed on the inner wall surface of the hole 503A,
The wheel shaft 51 is screwed. In the connecting rod 500, a hole 504A is formed in the connecting portion 504 connecting the arms 501 to 503, and the guide rod 6 is formed in the hole 504A.
0 is slidably inserted. Guide rod objective lens 1
The ends on the 0L and 10R sides are fixed to support holes 110B formed in the eyepiece-side support portion 102 of the mount 110 shown in FIG. Note that members, mounting holes, and the like of the mounting base 110 having the same configuration as the mounting base 100 of the first embodiment are denoted by the same reference numerals as in FIG.

The connecting rod 500 has a cross-sectional shape cut along a plane perpendicular to the optical axes Ol ′ and Or ′, and the hole 503A and the hole 504A are on opposite sides of a straight line connecting the center of the hole 501A and the center of the hole 502A. Is positioned at Also, the hole 50
A straight line connecting the center of the hole 1A and the center of the hole 502A;
03 is formed so that the central axis along the longitudinal direction is orthogonal. In other words, the longitudinal lengths of the arms 501 and 502 are equal to each other, shorter than the longitudinal length of the arm 503, and the cross-sectional shape of the connecting rod 500 cut along a plane perpendicular to the optical axes Ol ′ and Or ′. Has a substantially arrow shape.

The columnar projection 421L is sandwiched between the pin 311 and the arm 501, and the optical axis O of the objective lens 10L.
1 is rotatably supported by the arm 501 about the center of rotation, the columnar projection 421R is sandwiched between the pin 312 and the arm 502, and is supported by the arm 502 so as to be rotatable about the optical axis Or of the objective lens 10R. I have.

The connecting rod 500 and the mount 110 described above are arranged on a binocular having the same configuration as the binocular 1 of the first embodiment.

As in the first embodiment, the left eyepiece unit 31
The L mounting frame 35L is rotatably fitted in the mounting hole 102L of the mounting base 110, and the mounting frame 35R of the right eyepiece unit 31R.
Is rotatably fitted into the mounting hole 102R of the mounting base 110,
The holder 42L is rotatably supported about the optical axis Ol of the objective lens 10L, and the holder 42R is rotatably supported about the optical axis Or of the objective lens 10R. Therefore, in the state shown in FIG.
When an external force is applied so that 1L rotates clockwise and the right eyepiece unit 31R rotates counterclockwise, the left eyepiece unit 31L and the right eyepiece unit 31R respectively become the objective lens 1R.
It rotates in conjunction with the optical axis Ol of 0L and the optical axis Or of the objective lens 10R. As a result, as shown in FIG. 12, the distance between the optical axis of the eyepiece 40L and the optical axis of the eyepiece 40R is reduced.

The support structure of the wheel shaft 51 in the support hole 102A of the mount 110 and the support structure of the guide rod 60 in the support hole 110B are the same as those in the first embodiment. Therefore, when the user rotates the wheel 50, the connecting rod 500 moves along the optical axes Ol 'and Or', and the focusing operation is performed.

As described above, according to the first and second embodiments, the objective-side support portion 101 and the eyepiece-side support portion 102 of the mount 100 are integrally formed so as to be parallel. Therefore, as described above, the mounting hole 10
1L and the mounting hole 102L of the eyepiece-side support part 102, and the mounting hole 101R of the objective-side support part 101 and the eyepiece-side support part 102
It is easy to drill the respective mounting holes 102R coaxially. Further, the support holes 102A and 102B,
110B is bored in the eyepiece side support part 102. Therefore, by supporting the ends of the roller shaft 51 and the guide rod 60 with the support holes 102A and 102B (110B), the respective axes of the roller shaft 51 and the guide rod 60 are oriented in the axial directions of the mounting holes described above. It is easy to arrange so as to be parallel to.

In the first and second embodiments, the focus adjusting mechanism of the binoculars 1 which is of the two-axis interlocking type is provided on the eyepiece group 40L, 40R side.
A sufficiently large space is secured near L and 10R. As a result, the image blur correction device 20 including the correction lenses 20L and 20R and its driving mechanism is moved to the objective lenses 10L and 1L.
It can be arranged in the space secured near 0R,
Even if the image blur correction function is added, the size of the entire binoculars 1 can be reduced. Further, the focus adjustment mechanism has an eyepiece lens group 40L,
40R side, the objective lenses 10L, 10R
Are not concentrated around the binoculars, the center of gravity of the binoculars 1 is located near the center of the binoculars housing, and the weight balance is improved.

[0085]

As described above, according to the present invention, it is possible to obtain a focusing device for a two-axis interlocking binocular, which can be applied to various models.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of binoculars to which a first embodiment of the present invention is applied, which is cut by a plane including a pair of optical axes.

FIG. 2 is a partial cross-sectional view of a central portion of the binoculars according to the first embodiment cut along a plane orthogonal to a plane including a pair of optical axes.

FIG. 3 is a perspective view of a mounting base.

FIG. 4 is a front view of a mounting base.

FIG. 5 is a view showing one step in the production of the mounting base.

FIG. 6 is a front view showing the image blur correction device provided on the mount from the eyepiece side.

FIG. 7 is a front view showing the image blur correction device provided on the mount from the objective lens side.

FIG. 8 is a front view showing the connecting rod in a state where the interpupillary distance of the eyepiece is maximized.

FIG. 9 is a front view showing the connecting rod in a state where the interpupillary distance of the eyepiece is minimized.

FIG. 10 is a front view showing a connecting rod to which the second embodiment of the present invention is applied in a state where an interpupillary distance of an eyepiece is maximized.

FIG. 11 is a perspective view showing a mounting base of the second embodiment.

FIG. 12 is a front view showing the connecting rod of the second embodiment in a state where an eyepiece interpupillary distance is minimized.

[Explanation of symbols]

 10L, 10R Objective lens 20L, 20R Correction lens 30L, 30R Image reversing optical system 40L, 40R Eyepiece lens group 11L, 11R Objective lens barrel 20 Image shake correction device 31L, 31R Eyepiece unit 32L, 32R Prism frame 33L, 33R Eyepiece Frame 35L, 35R Eyepiece tube support frame 41L, 41R Eyepiece lens tube tube 42L, 42R Holder 50 Roller wheel 51 Roller shaft 60 Guide rod 70 Reinforcement plate 100, 110 Mounting base 200 Correction lens holding frame 300, 500 Connecting rod

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Jun Fubo 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Gaku Kogyo Co., Ltd. F-term (reference) 2H039 AA05 AA06 AB14 AB16 AB32

Claims (9)

[Claims] An object optical system is fixedly supported by a single support member, and an eyepiece optical axis of an eyepiece optical system is provided in each of the pair of telephoto optical systems. An eyepiece optical system holding unit that holds the eyepiece optical system so that the eyepiece optical system is parallel to the objective system optical axis at a predetermined distance and can swing about the objective system optical axis. In the two-axis interlocking binoculars in which the eyepiece unit having: is rotatably supported by the support member, a connecting member that connects the eyepiece optical system holding units of the pair of telephoto optical systems, A focusing device for binoculars, comprising: a driving member that drives in a direction parallel to a system optical axis. 2. A drive shaft, which is screwed to the connecting member, is rotatable around an axis parallel to the eyepiece optical axis, and is fixed in a direction parallel to the axis. The focusing device for binoculars according to claim 1, further comprising: a rotation preventing member configured to prevent rotation of the driving shaft from being transmitted to the connecting member. 3. The rotation preventing member is a columnar member having a longitudinal direction extending in parallel with the drive shaft and penetrating the connecting member, and guides movement of the connecting member in a direction parallel to the eyepiece optical axis. The focusing device for binoculars according to claim 2, wherein: 4. The connecting member includes: a rotation preventing member supporting portion for supporting the rotation preventing member; a driving shaft supporting portion on which the driving shaft is screwed; and the eyepiece optical system of each of the pair of telephoto optical systems. A pair of optical system support portions that support the holding portion; a first connection portion that connects the rotation prevention member support portion and one of the pair of optical system support portions; a rotation prevention member support portion and the pair of optics 4. The binoculars according to claim 3, further comprising: a second connecting portion that connects the other of the system support portions; and a third connecting portion that connects the drive shaft support portion and the rotation preventing member support portion. 5. Focusing device. 5. In the connecting member, a length of the third connecting portion along a longitudinal direction is shorter than a length of the first connecting portion and the second connecting portion along a longitudinal direction. The binocular focusing device according to claim 4, characterized in that: 6. The connecting member, wherein a length of the third connecting portion along a longitudinal direction is longer than a length of the first connecting portion and the second connecting portion along a longitudinal direction. The binocular focusing device according to claim 4, characterized in that: 7. The drive shaft, wherein the single support member is formed integrally with an objective optical system support portion that supports the objective optical system and an eyepiece optical system support portion that supports the eyepiece unit. 3. The binocular focusing device according to claim 2, wherein the rotation preventing member is supported by a bearing provided on the support member. 4. 8. The binoculars according to claim 1, wherein a movable optical system is provided between the objective optical system and the image inverting optical system in each of the pair of telephoto optical systems. Focusing device. 9. The movable optical system is a correction optical system for correcting image blur, and a drive mechanism for driving the correction optical system is provided between the objective optical system and the image inversion optical system. The focusing device for binoculars according to claim 8, wherein: